Brake adjusting lever ("ratchet") - a node of wheel braking mechanisms of vehicles equipped with pneumatic brake system; a device for transferring the moment of force from the brake chamber to the drive of brake pads and regulating (manually or automatically) the working gap between the friction pads of pads and the surface of the brake drum by changing the angle of the expander cam. The majority of modern heavy wheeled vehicles and various automotive and tractor equipment is equipped with a brake system with pneumatic drive.
The drive of mechanisms mounted on the wheels in such a system is carried out with the help of brake chambers (BC), the stroke of which cannot be changed or can be changed within very narrow limits. This can lead to deterioration of the brakes when the brake shoe linings wear - at some point the stroke of the rod will no longer be enough to select the increased distance between the lining and the surface of the drum, and braking simply does not occur.
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